1

What is the normal (expected) idle under normal weather conditions. I think my Blazer idles too high even in the summer days. The current readings are about 1000-1100rpm cold and 600-700rpm warm. It doesn't sound too much but subjectively it just runs too high.

  • I checked vacuum leak several times with different techniques but never found one
  • Checked and cleaned IAC and throttle body, both were fine too.
  • 2
    If you start the engine cold, and it idles 1100rpm -> 700rpm in ~5 mins (fast idle, to warm up quicker), then you should not worry. – oryades Aug 16 '17 at 7:32
  • Let me perhaps add one finding. Right after crank up (cold start), the engine idles lower (about 800rpm), then about in one second it goes to the 1000-1100 range and very slowly lowers the RPM to the target 600-700. It doesn't matter on outside temperature or humidity at all. – Jan Aug 22 '17 at 6:37
1

A v8 once warm can easily idle comfortably around 600rpm (in good condition...), my 3.5litre v8 did that all the time once warm (but not fully up to temp...).

  • Even my small 1.33 litre inline-4 idled in some cases below 600RPM. – juhist Aug 16 '17 at 12:06
  • not necessarily as smooth though - inline 6's are also very smooth, but 4 cyl not so... – Solar Mike Aug 16 '17 at 13:49

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.